Suction hose for vacuum cleaning system for use with hose plug-in and hose retracting outlets

ABSTRACT

A suction hose for a vacuum cleaning system is provided with adapter means on the end thereof for selective connection to a plug-in receptacle outlet as well as a receptacle outlet of the hose retracting type and for permitting the hose to be moved into retractably stored position in the conduit connecting the retracting type of receptacle outlet to the vacuum cleaner unit.

United States Patent Hamrick 14 1 Aug. 8, 1972 s41 SUCTION HOSE FOR VACUUM [56] References Cited CLEANING SYSTEM FOR USE WITH HOSE PLUGIN AND HOSE UNITED STATES PATENTS RETRACTING OUTLETS 1,810,607 6/1931 Irons ..15/313 2,839,316 6/l958 Kasper ..285/7 1 ntor: Jam Hamrick, Matthews. NC 2,953,806 9/1960 Walker 15/315 3,353,996 11/1967 Hamrick ..l5/315 X A Jet Line Products, Inc., Matthews, [73] sslgnee N.C. Primary Examiner'l'h0mas F. Callaghan Attorney-Parrott, Bell, Seltzer, Park & Gibson [22] Filed: Jan. 7, 1971 [57] ABSTRACT Appl- 104,634 A suction hose for a vacuum cleaning system is provided with adapter means on the end thereof for selec- Re Application Dam tive connection to a plug-in receptacle outlet as well [62] Division of Ser. No. 788,376, Jan. 2, 1969, Pat. as a receptacle Outlet of the hose retracting y e and 3593363. for permitting the hose to be moved into retractably stored position in the conduit connecting the retract- US. Cl. ..285/7, ing type of receptacle utlet to the vacuum h {51} Int. Cl. ..A4715/38 i [58] Field of Search ..285/7, 12,302; 15/315, 314,

15/313, 323 9 Claims, 22 Drawing Figures 110 1 35 8b 1 ll V//////l 32 45 H5 PATENTEIW 8 SHEET 1 BF 5 PAIENTEDws a an SHEEI 2 BF 5 INVENTORI JAMES C. HAMRiQK fiwzzeawgw Jim,

ATTORNEYS PATENTED 3 I973 SHEET 3 OF 5 INVENTOR: JAMes C. HAMEIQK wmmmgfimmw ATTORNEYS PATENTED NIB 3 I973 SHEU '4 OF 5 INVENTOR: JANE-5 C. HAMmcK ATTORNEYS PATENTEDM W 3.682.500

sum 5 or 5 III [M INVENTOR:

JAMes C. HAMEIQK.

52 5' g ggj g fiuq a/m ATTORNEYES SUCTION HOSE FOR VACUUM CLEANING SYSTEM FOR USE WITH HOSE PLUG-IN AND HOSE RETRACTING OUTLETS This application is a division of my co-pending application, Ser. No. 788,376, filed Jan. 2, I969, now U.S. Pat. No. 3,593,363 and entitled VACUUM CLEAN- ING SYSTEM WITH HOSE PLUG-IN AND HOSE RETRACTING OUTLETS.

It is a primary object of this invention to provide an improved vacuum cleaning system of the type having a wall-mounted or floor installed, self-contained vacuum cleaner unit with at least one auxiliary outlet receptacle for accommodation and storage of a suction hose therein. As is well known, such self-contained vacuum cleaner units heretofore have never been provided with auxiliary outlet receptacles for the storage of the suction hose but merely with auxiliary outlet receptacles for accommodating plugging in of the suction hose for cleaning. This has necessitated the need for rolling up the suction hose and separately storing the same in a closet or some remote location when the cleaner unit was not being utilized.

Briefly stated, this improved vacuum cleaning system has been achieved by providing the suction hose with adapter means on the end thereof for ready accommodation in the plug-in receptacle conventionally provided on the self-contained cleaner unit and with piston means for accommodation in an auxiliary outlet receptacle of the retracting type for permitting the hose to be moved into retractably stored position in the conduit connecting the auxiliary outlet receptacle to the vacuum cleaner unit.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawings, in which:

FIG. 1 is a schematic perspective view of one embodiment of the improved vacuum cleaning system in which a floor-installed, self-contained vacuum cleaning unit having its own plug-in outlet receptacle has a plurality of auxiliary receptacles connected thereto, and showing a hose stored in the conduit associated with an auxiliary receptacle of the hose-retracting type, and also showing another flexible suction hose operatively connected to a plug-in type of outlet receptacle;

FIG. 2 is an enlarged fragmentary vertical sectional view taken substantially along line 2-2 in FIG. 1 and showing a plug-in outlet receptacle mounted in a vertical wall structure of the building;

FIG. 3 is a fragmentary vertical sectional view taken substantially along line 33 in FIG. I and showing a plug-in outlet receptacle mounted in the floor structure of the building;

FIG. 4 is an enlarged fragmentary vertical sectional view taken substantially along line 4-4 in FIG. I and showing a floor installed, hose-retracting outlet receptacle with a flexible suction hose stored within the corresponding conduit and the head-end adapter of the hose positioned within the receptacle;

FIGS. 5, 6 and 7 are schematic views of the vacuum cleaning system of FIG. 1, but showing one of the flexible suction hoses thereof connected to different plug-in receptacles in FIGS. and 6 and showing the flexible suction hose in FIG. '7 stored in a different conduit from that in which it is shown stored within in FIG. 1;

FIG. 8 is an enlarged perspective view of the floor-installed, self-contained vacuum cleaner unit shown in the left-hand portion of FIG. 1;

FIG. 9 is a view similar to FIG. I illustrating a second embodiment of the vacuum cleaning system of the instant invention, wherein the self-contained vacuum cleaner unit is installed in a vertical wall of the building;

FIG. I0 is an enlarged perspective view of the foot end of the flexible suction hose shown in the lower portion of FIG. I, but wherein the hose is removed from the suction conduit, and showing a first form of footend adapter means on the hose, wherein a plug-in adapter and a flexible piston are both fixed with respect to the foot end of the suction hose;

FIG. 11 is a fragmentary vertical sectional view through a portion of the lowermost conduit of FIG. I with the foot-end of the suction hose positioned within the conduit and having the adapter means of FIG. I0 mounted on the foot end thereof;

FIG. 12 is a fragmentary vertical sectional view of a floor-installed plug-in outlet receptacle such as that shown in FIG. 3, but showing the hose of FIG. 10 and its adapter means operatively connected to the plug-in outlet receptacle;

FIG. 13 is a fragmentary vertical sectional view through the hose-retracting outlet receptacle of FIG. 4, but showing the foot-end adapter means of the hose of FIG. 10 positioned partially within the hose-retracting receptacle;

FIGS. 14-17 are views similar to the respective FIGS. 10-13, but showing a second form of hose footend adapter means in which the piston and its tubular adapter are fixed to the foot end of the suction hose, and the plug-in adapter is removably connected to the foot-end adapter on which the piston is mounted;

FIGS. 18-21 are views similar to the respective FIGS. 10-13, but wherein the foot-end plug-in adapter is fixedly secured to the foot end of the hose and the piston-carrying adapter is removably connected to the outer end of the plug-in adapter, the piston adapter being removed whenever the hose is operatively connected to a plug-in receptacle; and

FIG. 22 is an enlarged fragmentary vertical sectional view similar to FIG. 21, but showing the door of the outlet receptacle occupying closed position with the piston adapter stored within the hose-retracting receptacle, as might be the case when the hose is being used with the foot-end adapter thereof plugged into a plug-in outlet receptacle as in FIG. 20.

Referring more specifically to the drawings, with particular reference to FIGS. 1-8, the first embodiment of the improved vacuum cleaning system of this invention comprises a self-contained vacuum cleaner unit 30 having its own plug-in outlet receptacle 31, and is shown as being of a type which is installed in the floor 32 of a building. A plurality of auxiliary outlet receptacles 33-36 are positioned at various locations in the corresponding building and are connected, by suitable conduit means, to the air inlet of vacuum cleaner unit 30. As shown, the conduit means includes elongate suction conduits 43-46 for the respective auxiliary outlet receptacles 33-35. All the suction conduits 43-46 may be communicatively connected to the air inlet of vacuum cleaner unit 30 by a common suction conduit 47.

In the particular exemplary arrangement of auxiliary outlet receptacles shown in FIGS. 1, 5, 6 and 7, outlet receptacles 33, 34 are of the hose-retracting type and outlet receptacles 35, 36 are of the plug-in type. The auxiliary outlet receptacles may be positioned in any desired location and, by way of example, outlet receptacles 33, 35 are shown positioned in the floor 32 and outlet receptacles 34, 36 are positioned in respective substantially vertical wall structures 50, 51. The ends of the suction conduits 43-46 remote from vacuum cleaner unit 30, may be directly connected to tubular members of the respective auxiliary outlet receptacles 33-36, as is the case with respect to suction conduit 45. However, the suction conduits 43, 44, 46 are shown connected to the tubular members of the respective auxiliary outlet receptacles 33, 34, 36 by means of respective flexible sleeves or suction conduit extensions 53, 54, 56.

The term hose-retracting outlet receptacle" is used in the specification and appending claims to distinguish the same from the plug-in outlet receptacles and means that the hose receiving tubular portion of the receptacle is adapted for passage of substantially the entire length of the suction hose therethrough, with exception of a head-end adapter on the hose, and that the associated suction conduit is of such internal cross-sectional configuration and length as to receive and store therein substantially the entire length of a corresponding suction hose. On the other hand, the term plug-in outlet receptacle" is used in the specification and appending claims to mean that the receptacle is adapted for the connection of the foot end of a flexible suction hose thereto, but that the hose would not be stored normally within the associated conduit or other tubular member to which the receptacle is connected, and/or the internal diameter or configuration of the hose receiving tubular portion of the receptacle is such that only a relatively short length of the foot end of the hose, or the reduced portion of a foot-end adapter thereon, can be accommodated by the receptacle. ln FIGS. 1 and 4, for example, a hand-operated flexible suction hose 60 is shown stored within suction conduit 43 with an enlarged head-end adapter 61 on the suction hose 60 being positioned within the hose-retracting receptacle 33.

Also, in FIG. 1, an additional hand-operated flexible suction hose 60a is shown connected to the auxiliary plug-in outlet receptacle 35, although hose 60a is omitted in FIG. 3. The tubular head-end adapter 610 of the second flexible suction hose 600 has a suitable cleaning implement 63 attached thereto, which cleaning implement is removed from the hose 600 when the hose 60a is to be stored in one or the other of the conduits 43, 44. The floor-installed vacuum cleaner unit 30 of the first embodiment of the vacuum cleaning system shown in FIGS. 1-7 may be of the type disclosed in my co-pending application, Ser. No. 788,395 entitled FLOOR INSTALLABLE VACUUM CLEANER, filed Jan. 2, I969, and comprises a substantially rectangular casing 65 (FIG. 8) having a substantially vertical partition 66 therein which divides casing 65 into a power compartment and a vacuum or dust collection compartment. An electrically operable suction device or fan 67 and an air inlet fitting 70 are positioned within the power compartment of casing 65. The inlet fitting 70 penetrates one exterior end wall of casing 67 and serves as the air inlet of the vacuum cleaner unit 30, to the extent that the air inlet fitting 70 has one end of the common suction conduit 47 communicatively connected thereto. The other end of the air inlet fitting 70 extends through partition 66 into the dust collection compartment and is communicatively connected to a suitable dust collector or filter bag 72 positioned within the collection compartment.

The top wall 73 of the vacuum cleaner unit 30 may be substantially flush with the upper surface of floor 32 (FIG. 1) and has a substantially rectangular body 74 of the main plug-in outlet receptacle 31 mounted therein.

The main plug-in receptacle 3] further comprises a tubular member 75 which is communicatively connected to air inlet fitting 70 and projects upwardly through the substantially rectangular body 74. A door 76 is pivotally mounted on the substantially rectangular body 74 so that it may be moved to closed position to close the open upper end of tubular member 75 when the main outlet receptacle 3] is not being used. The body 74 of main outlet receptacle 31 carries a suitable switch 77 for operating the electric suction device 67.

The exhaust side of the suction device 67 communicates with the atmosphere exteriorly of casing 65 through a suitable exhaust opening 80 in one of the end walls of casing 67.

The two auxiliary plug-in outlet receptacles 35, 36

are each quite similar to main plug-in receptacle 31 in receptacle 31 in that they are formed with a right-angular bend therein, or are in the form of what is generally called an elbow, to facilitate connection of the corresponding suction conduit thereto.

While all the conduits 43-46 may be of substantially the same external and internal diameter, the open ends of the tubular members 75 and 85 of the plug-in outlet receptacles 31, 35, 36 are of substantially lesser internal diameter than at least those suction conduits 43, 44 which are adapted for storage of a flexible suction hose therein. A resilient sealing member 88 may be adhesively or otherwise secured to the inner surface of each door 86 for engaging the outer end of the corresponding tubular member 85 when the door 86 occupies closed position so as to prevent leakage of air through the corresponding tubular member when the plug-in outlet receptacle is not being used. A similar sealing member may be provided on the door 76 of main plugin receptacle 31.

As preferred, each hose-retracting outlet receptacle 33, 34 is shown as being of a type similar to that disclosed in my U.S Pat. No. 3,464,859, entitled METHOD AND APPARATUS FOR VACUUM CLEANING. Each of the auxiliary hose-retracting outlet receptacles 33, 34 also comprises a body 94, a tubular hose-receiving member 95, a hinged cover 96 and a sealing member 98, which are arranged somewhat similar to the corresponding elements 84, 85, 86, 88 of the auxiliary plug-in outlet receptacles. However, the tubular hoseireceiving member 95 of each hoseretracting outlet receptacle 33, 34 extends at a steep angle with respect to the body 94 and also is of substantially greater internal diameter than the internal diameter of the outer end of the tubular members 85 of the auxiliary plug-in receptacles 35, 36 so as to loosely receive therein the enlarged head-end adapter 61 or 61a of the corresponding flexible suction hose 60 or 604, and also to facilitate passage of a flexible piston means to be later described which is of substantially greater diameter than the body of the flexible hose, into and out of the corresponding suction conduit through each auxiliary hose-retracting outlet receptacle 33, 34.

Each hose-retracting outlet receptacle 33, 34 also differs from the plug-in receptacles 31, 35, 36 in that the lower end of each tubular member 95 is provided with an internal annular abutment 100 thereon whose internal diameter is less than the external diameter of the head-end adapter 61, 61a of each hose 60, 60a, but whose internal diameter is greater than the external diameter of the body of each flexible hose 60, 60a. Thus, when either head-end adapter is loosely positioned within tubular member 95 as shown in FIG. 4, the head-end adapter will engage and be restrained from further inward movement by the corresponding annular abutment 100 when the flexible hose occupies fully retracted or stored position within the corresponding suction conduit 43 or 44.

In FIGS. 5, 6 and 7, the second flexible suction hose 600 has been omitted, although it may be in use at out let receptacles not shown being used in these views or it may be stored within that suction conduit 43 or 44 which is not then being used. FIGS. 5, 6 and 7 particularly illustrate how the suction hose 60 may be used selectively at different outlet receptacles. For example, in FIG. 5, the foot end of suction hose 60 is shown connected to the main plug-in outlet receptacle 31 of the self-contained vacuum cleaner unit 30. As another example, in FIG. 6, the foot end of suction hose 60 is connected to the auxiliary plug-in receptacle 36 and, in FIG. 7, suction hose 60 is stored in the conduit 44 extending from the auxiliary hose-retracting receptacle 34.

In the embodiment of the vacuum cleaning system shown in FIG. 9, a wall-installed vacuum cleaner unit is employed, which unit is mounted in a substantially vertical wall 102. The vacuum cleaner unit of FIG. 9 is broadly designated at 30' and includes a main plug-in outlet receptacle 31, as well as a suction device and collector not shown in FIG. 9, but which may be arranged in a manner somewhat similar to that shown in FIG. 8. Also, reference is made to my US. Pat. No. 3,422,482, for further details of a wall-mounted vacuum cleaner unit such as is shown in FIG. 9. Accordingly, a further description thereof is deemed unnecessary.

In all other respects, the vacuum cleaning system of F IG. 9 is substantially the same as that disclosed in FIG. 1 through 7 and, therefore, those parts in FIG. 9 which correspond to similar parts shown in FIG. 1 through 7 will bear the same reference characters with the prime notation added and a further description thereof will not be given in order to avoid repetitive description.

Various forms of hose foot-end adapter means are provided to adapt each flexible suction hose for connection selectively to all the suction outlet receptacles. A first form of hose foot-end adapter means is shown in FIG. 10-13 in which both a rigid, tubular, plug-in adapter 110 and a flexible, collapsible, annular piston 111 are fixed with respect to the foot end of the elongate flexible tubular body 112 of hose 60. In fact, as preferred, the foot-end plug-in adapter 110 serves also as a piston-carrying adapter, although it is to be understood that piston 111 may encircle and be secured directly to hose body 112.

As shown in FIG. 10, hose body 112 is of fabriccovered flexible rubber-like tubular construction, and one end of plug-in adapter 110 encircles and is adhesively or otherwise fixedly secured to hose body 112. Piston 111 is formed from a thin-walled resilient material and is positioned around a medial portion of adapter 110 between suitable retaining annular shoulders 113, 114 on adapter 110. The free or outer end of plug-in adapter 110 has a relatively short reduced portion 115 thereon which is adapted to fit loosely within the plug-in outlet receptacles 31, 35, 36. Reduced portion 115 may be provided with a resilient annular sealing ring or O-ring 116 thereon to provide a seal between the plug-in adapter and the tubular member of the corresponding plug-in outlet receptacle.

The diameter of adapter 110 is less than the internal diameter of the hose-storage suction conduits 43, 44, their respective flexible sleeves 53, 54, and the annular shoulder 100 in the tubular member of each auxiliary hose-retracting receptacle 33, 34. However, the external diameter of piston 111 normally is about the same as or slightly greater than the internal diameter of the hose-storage suction conduits 43, 44 and their respective tubular flexible extensions 53, 54, as well as being of greater diameter than the annular shoulder in the tubular member 95 of each auxiliary hoseretracting receptacle 33, 34.

By way of example, the auxiliary hose-retracting outlet receptacle 33 is shown in FIG. 13, wherein it will be observed that, while the hose 60 is in use, piston 11] may engage the outer surface of annular shoulder 100 so that, in normal use, such interengagement of the piston 111 with annular shoulder 100 will prevent hose 60 from creeping into suction conduit 43 through sleeve 53 and hose-retracting receptacle 33 due to the suction in conduit 43. However, the collapsible or resilient nature of piston 111 is such that the hose 60 may be twisted slightly and/or a greater than normal linear pushing force may be applied thereto by the operator to cause the piston to move past annular shoulder 100. Thereupon, a plug-in adapter 110, piston 111 and the body 112 of hose 60 may be retracted into stored position within sleeve 53 and suction conduit 43 by suction, and the head-end adapter then may be positioned within tubular member 95 of hose-retracting receptacle 33 as shown in FIG. 4. It will be noted in FIG. 11 that piston 111 yieldably engages the inner peripheral surface of suction conduit 43 so as to prevent the flow of air past piston 111 while the hose is being retracted and while it is being used and is only partly withdrawn from suction conduit 43 during such use. It is apparent that hose 60 with the piston I11, plug-in adapter 110 and head-end adapter 61 thereon also may be readily entirely withdrawn from the hoseretracting receptacle 33 when the flexible suction hose 60 is to be used at any of the other outlet receptacles shown in FIG. 1.

While utilizing suction hose 60 with the piston 111 and foot-end plug-in adapter 1 10 positioned within suction conduit 43 or its flexible sleeve 53, or with the piston positioned within tubular member 95 and the plug-in adapter 110 projecting into sleeve 95 as shown in FIG. 13, dust tends to collect on and adhere to those exterior surfaces of adapter 110 and piston 111 which face toward the source of suction embodied in suction device 67 of FIG. 8. Consequently, in the course of subsequently transferring hose 60 from the corresponding auxiliary hose-retracting outlet receptacle 33 to another of the outlet receptacles in the vacuum cleaning system of FIGS. 1-7, it may be necessary for an operator to wipe the accumulated dust off of the plugin adapter 1 10 and the piston 1 11 so as to avoid soiling the operator's hands while the plug-in adapter is being plugged into another of the plug-in outlet receptacles 31, 35, 36, or while the piston 111 on the hose 60 is being inserted into the hose-retracting receptacle 34 of FIGS. 1, 5, 6 and 7. Also, the dust adhering to the adapter might soil areas of the floor or carpet thereon if the hose is dragged along the floor during transfer thereof from either of the hose-retracting outlet receptacles to another of the outlet receptacles.

Although the adherence of dust to foot-end plug-in adapter 1 10 may not present a serious problem, second and third forms of hose foot-end adapter means are illustrated in the respective FIGS. 1417 and 18-22 which will substantially eliminate the problem of dust adhering to the foot-end plug-in adapter means by providing adapters which are detachable connected to the foot ends of the flexible suction hoses.

Referring now to the second form of hose foot-end adapter means shown in FIGS. 14-17, for the purpose of description it may be assumed that suction hose 60 of FIG. 14-17 is the same hose as that shown positioned in the suction conduit 43' and auxiliary hoseretracting receptacle 33 in FIG. 9. Accordingly, the auxiliary plug-in receptacle of FIG. 16 is indicated at 35' and the auxiliary hose-retracting outlet receptacle of FIG. 17 is indicated at 33' to correspond with the embodiment of FIG. 9. Elements 32',45', 84', 85', 86', 88 in FIG. 16 correspond with elements 32, 45, 84, 85, 86, 88 in FIG. 3, and elements 32', 53', 94', 95', 96', 98', 100' correspond with elements 32, 53, 94, 95, 96, 98, 100 in FIG. 4.

Essentially, the second form of hose foot-end adapter means differs from the first form in that piston 111' thereof is fixed to the body 112' of hose 60', and the plug-in adapter 110' is detachably connected to the hose body 112' through an intervening rigid tubular adapter 120 serving as a piston adapter in this instance. Here again, it is to be understood that the piston 111' of FIGS. 1417 may encircle and be secured directly to hose body 1 12'.

It is preferred, however, that piston 11 1'; which may be identical to piston 111, is mounted on piston adapter 120 in the same manner as that in which piston 111 is mounted on the adapter 110 of FIG. 10. The separate plug-in adapter 110' is adapted to be detachably connected to piston adapter 120 in substantially axial alignment therewith. Like plug-in adapter 110, adapter 110' is provided with a reduced outer end portion 1 15 having an O-ring 1 16' therearound. Any suitable means may be provided for detachably connecting plug-in adapter 110' to the outer end of piston adapter 120. As shown, the inner end of plug-in adapter 110' is provided with a reduced tubular extension 121 which is adapted to be slidably received within tubular piston adapter 120 and which is provided with a pair of opposed bayonet slots 122 therethrough (only one of which is shown) for engagement with respective pins 123 projecting inwardly from diametrically opposed portions of tubular piston adapter 120.

It is apparent by referring to FIG. 16, that plug-in adapter 110' is connected to piston adapter 120 when the hose is plugged into tubular member of a plug-in outlet receptacle. However, when hose 60' is to be connected to a hose-retracting outlet receptacle, such as receptacle 33' in FIG. 17, and/or hose 60' is to be stored in the corresponding suction conduit 43' (Fig. 15), the plug-in adapter may be removed from piston adapter 120, as shown in FIGS. 15 and 17, and stored at any convenient location. Thus, dust then may collect on only a very small area of piston 1 1 1' and adapter 120 while utilizing suction hose 60' with a portion thereof positioned within suction conduit 43' and auxiliary hose-retracting outlet receptacle 33'.

The third form of hose foot-end adapter means shown in FIGS. 18-22 has the piston 111" and its adapter 120" separable from the foot-end plug-in adapter 110". However, the third form of adapter means differs from the second form in that plug-in adapter 110" is secured directly to the body 112" of flexible suction hose 60", and piston adapter 110" is adapted to be readily detachably connected to the outer end of the foot-end plug-in adapter 1 10' As is the case with respect to the foot-end plug-in adapters 110, 110', the third form of plug-in adapter 110" includes a reduced outer end portion about which a resilient sealing ring or Oring 116" is positioned. The foot-end plugin adapter 110" is secured directly to the foot end of hose body 112" as is the case with respect to the first form of foot-end plug-in adapter 110 of FIG. 10. However, piston 111" is mounted on its own separate piston adapter and may be held in the desired position on piston adapter 120" in the same manner as that described with respect to the piston 111 in FIG. 10.

In order to readily removably connect piston adapter 120" to the free end of and in axial alignment with plug-in adapter 110"suitable connecting means are provided on piston adapter 120' which is embodied in a reduced tubular extension 125 provided with a pair of diametrically opposed bayonet slots 126 therein, only one of which is shown in FIGS. 18 and 22. The tubular extension 125 of piston adapter 120" in FIG. 18 is adapted to be slidably received in the outer end portion of foot-end plug-in adapter 1 10", and the bayonet slots 126 thereof are engaged by a pair of diametrically opposed pins 127 for locking the piston adapter 120" in engagement with the plug-in adapter 1 10".

In FIGS. 20 and 21, respective suction outlet receptacles 35", 33" are shown which may be identical to and may correspond with respective outlet receptacles 35, 33 of the first embodiment of the vacuum cleaning system shown in FIGS. 1 through 8. Thus, the elements 32", 45", B4", 85", 86", 88" of FIG. 20 correspond to the respective elements 32, 45, 84, 85, 86, 88 shown in FIG. 3, and the elements 32", 43", 53", 94", 95", 96", 98", 100" of FIGS. 21 and 22 correspond to the respective elements 32, 43, 53, 94, 95, 96, 9B, 100 shown in FIG. 4. Further, a portion of that hose-storage suction conduit 43", extending from the hose-retracting receptacle 33", is shown in FIG. 19.

By referring to FIG. 20, it is apparent that piston adapter 120" is removed from foot-end plug-in adapter 110" whenever hose 60" is being used at a plug-in receptacle. While hose 60" is being used at a plug-in receptacle, such as the plug-in receptacle 35" of FIG. 20, piston adapter 120", with its piston 111" thereon, may be stored in any desired location. Conveniently, the detached piston adapter 120" may be stored in a hose-retracting outlet receptacle, such as the receptacle 33", with the piston 11]" resting against the annular abutment I" as shown in FIG. 22, and during which the door 96" of hose-retracting outlet receptacle 33" may occupy closed position.

After cleaning room areas adjacent plug-in receptacle 35", for example, piston adapter I1 I" is coupled to plug-in adapter ll0"in the manner heretofore described, and hose 60" then may be positioned in and stored in suction conduit 43" as shown in FIG. 19. It is apparent that, during use of hose 60" at the corresponding hose-retracting receptacle 33", piston Ill" will prevent dust from getting onto exterior surfaces of plug in adapter 110" so that, upon removal of suction hose 60" from the hose-retracting outlet receptacle 33", the operator may readily remove piston adapter 120" from plug-in adapter 110" and again store the same in outlet receptacle 33" while the hose 60" is being used at another plug-in outlet receptacle.

From the foregoing description, it is apparent that, considering both the second and third forms of adapter means, the foot-end adapter which is secured to the hose body need not necessarily be in the form of either a plug-in adapter or a piston adapter, and in which instance, the piston adapter 120" of FIG. 18 and the foot-end plug-in adapter 110' of FIG. [4 may be alternatively connected to that foot-end adapter then secured to the hose body, without departing from the invention.

The vacuum cleaning system of this invention is disclosed herein as having a plurality of auxiliary outlet receptacles in addition to a main plug-in outlet receptacle which is a part of a self-contained vacuum cleaner unit, and wherein at least one of the auxiliary outlet receptacles is of the hose-retracting type facilitating storage of a flexible suction hose in the corresponding conduit when the hose is not in use. Also, a plurality of flexible suction hoses may be used with the system as shown in FIG. 1. Essentially, however, one of the outstanding advantages of the cleaning system of this invention resides in the fact that it lends itself to the use of a single flexible suction hose, if desired, and only a single hose-retracting type of auxiliary outlet receptacle and associated suction conduit need be included in the system, if desired, in addition to a self-contained vacuum cleaner unit having its own plug-in outlet receptacle, for storage of the flexible suction hose in the latter suction conduit when the hose is not in use.

lll

Also, because of the novel adapter means associated with the hose, the hose may be selectively uperalively connected to both the plug-in and hose-retracting types of outlet receptacle when being used for cleaning adjacent areas.

In the drawings and specification there have been set forth preferred embodiments of the invention and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation.

lclaim:

l. A flexible suction hose for use with vacuum cleaning equipment of the type having tubular suction outlet receptacles, conduits secured to one end of the receptacles and hoses connected to the other end, said flexible hose comprising an elongate flexible hose body having a foot end, a first tubular adapter fixedly secured on the foot end of said hose body, a second tubular adapter connected to said first adapter in substantially axial alignment therewith, one of said adapters being of the plug-in type and adapted to sealingly engage the internal end portion of the receptacle, and the other of said adapters having a flexible piston encircling the same and adapted to pass through a hose-retracting type of tubular suction outlet receptacle and to sealingly engage the internal surface of the conduit.

2. A flexible suction hose for use with vacuum cleaning equipment of the type having tubular suction outlet receptacles, conduits secured to one end of the receptacles and hoses connected to the other end, said flexible hose comprising an elongate flexible hose body having a foot end, a first tubular adapter fixedly secured on the foot end of said hose body, a second tubular adapter matingly removably connected to said first adapter in substantially axial alignment therewith and being readily removable from said first adapter, one of said adapters being of the plug-in type and adapted to sealingly engage the internal end portion of the receptacle, and resilient piston means on said other adapter adapted to pass through a hose-retracting type of a tubular suction outlet receptacle and to sealingly engage the internal surface of the conduit.

3. A flexible suction hose according to claim 2 wherein said second adapter is of the plug-in type and includes a substantially rigid tubular portion on its outer end adapted to fit in mating engagement with a tubular suction outlet receptacle of the plug-in type.

4. A flexible suction hose adapted for use with vacuum cleaning equipment of the type having a stationary hose-retracting outlet receptacle and a stationary plug-in outlet receptacle connected to a source of suction and wherein a suction conduit of greater length and internal diameter than the hose serves to connect a hose-receiving tubular member of the hoseretracting outlet receptacle to the source of suction; said flexible hose comprising an elongate hose body having a foot end, a flexible piston and a tubular plug-in adapter carried by the foot end of said hose body, said plug-in adapter having a portion adapted to be removably connected to said plug-in outlet receptacle, said piston and said plug-in adapter being positioned in substantially axial alignment with each other, and said piston being of external diameter greater than that of said plug-in adapter and adapted to be passed through the hose-retracting outlet receptacle and to sealingly engage the inner surface of said suction conduit whereby said hose may be used alternatively at both the hose-retracting receptacle and the plug-in receptacle and said hose may be stored, at least in part, within the suction conduit.

5. A flexible suction hose according to claim 4 wherein said flexible piston is fixedly secured on said hose body, and wherein said tubular plug-in adapter is also fixedly secured on said hose body and positioned axially outwardly of said piston.

6. A flexible suction hose according to claim 5 wherein said piston encircles and is attached to said plug-in adapter to thereby fixedly secure said piston on said hose body.

7. A flexible suction hose according to claim 4, wherein said piston is carried by said hose body by means of piston adapter fixedly secured to the foot end of said hose body and encircled by said piston and to which said piston is attached, and wherein said tubular plug-in adapter is matingly removably connected to said piston adapter.

8. A flexible suction hose according to claim 4 wherein said tubular plug-in adapter is fixedly secured on a portion of the foot end of said hose body, a tubular piston adapter on which said flexible piston is mounted,

and means detachably connecting said piston adapter to the plug-in adapter.

9. A flexible suction hose adapted for use with vacuum cleaning equipment of the type having a stationary hose-retracting outlet receptacle and a stationary plug-in outlet receptacle connected to a source of suction and wherein a suction conduit of greater length and internal diameter than the hose serves to connect a hose-receiving tubular member of the hoseretracting outlet receptacle to the source of suction; said flexible hose comprising an elongate hose body having a foot end, a flexible piston fixedly secured on a portion of the foot end of said hose body. a tubular plug-in adapter carried by the foot end of said hose body and positioned axially outwardly of said piston. said plug-in adapter having a portion remote from said piston body adapted to be removably connected to said plug-in outlet receptacle, and said piston being adapted to be passed through the hose-retracting outlet receptacle and to sealingly engage the inner surface of said suction conduit whereby said hose may be used alternatively at both the hose-retracting receptacle and the plug-in receptacle and said hose may be stored, at least in part, within the suction conduit.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No, 500 Dated August 8, 1972 Inventor(s) James Hamrick It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 5, Line 2, after 'hose' delete the "i". CLAIM 9 Column 12, Line 17, change piston" to --hose-- Signed and sealed this 9th day of January 1973.

(SEAL) Attest:

EDWARD M.PLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents FORM PO-IOSD [IO-69) UCOMM-Dc Dump 0 \LI uovuuulnr "0mm DIIICI "nu mun-no 

1. A flexible suction hose for use with vacuum cleaning equipment of the type having tubular suction outlet receptacles, conduits secured to one end of the receptacles and hoses connected to the other end, said flexible hose comprising an elongate flexible hose body having a foot end, a first tubular adapter fixedly secured on the foot end of said hose body, a second tubular adapter connected to said first adapter in substantially axial alignment therewith, one of said adapters being of the plug-in type and adapted to sealingly engage the internal end portion of the receptacle, and the other of said adapters having a flexible piston encircling the same and adapted to pass through a hose-retracting type of tubular suction outlet receptacle and to sealingly engage the internal surface of the conduit.
 2. A flexible suction hose for use with vacuum cleaning equipment of the type having tubular suction outlet receptacles, conduits secured to one end of the receptacles and hoses connected to the other end, said flexible hose comprising an elongate flexible hose body having a foot end, a first tubular adapter fixedly secured on the foot end of said hose body, a second tubular adapter matingly removably connected to said first adapter in substantially axial alignment therewith and being readily removable from said first adapter, one of said adapters being of the plug-in type and adapted to sealingly engage the internal end portion of the receptacle, and resilient piston means on said other adapter adapted to pass through a hose-retracting type of a tubular suction outlet receptacle and to sealingly engage the internal surface of the conduit.
 3. A flexible suction hose according to claim 2 wherein said second adapter is of the plug-in type and includes a substantially rigid tubular portion on its outer end adapted to fit in mating engagement with a tubular suction outlet receptacle of the plug-in type.
 4. A flexible suction hose adapted for use with vacuum cleaning equipment of the type having a stationary hose-retracting outlet receptacle and a stationary plug-in outlet receptacle connected to a source of suction and wherein a suction conduit of greater length and internal diameter than the hose serves to connect a hose-receiving tubular member of the hose-retracting outlet receptacle to the source of suction; said flexible hose comprising an elongate hose body having a foot end, a flexible piston and a tubular plug-in adapter carried by the foot end of said hose body, said plug-in adapter having a portion adapted to be removably connected to said plug-in outlet receptacle, said piston and said plug-in adapter being positioned in substantially axial alignment with each other, and said piston being of external diameter greater than that of said plug-in adapter and adapted to be passed through the hose-retracting outlet receptacle and to sealingly engage the inner surface of said suction conduit whereby said hose may be used alternatively at both the hose-retracting receptacle and the plug-in receptacle and said hose may be stored, at least in part, within the suction conduit.
 5. A flexible suction hose according to claim 4 wherein said flexible piston is fixedly secured on said hose body, and wherein said tubular plug-in adapter is also fixedly secured on said hose body and positioned axially outwardly of said piston.
 6. A flexible suction hose according to claim 5 wherein said piston encircles and is attached to said plug-in adapter to thereby fixedly secure said piston on said hose body.
 7. A flexible suction hose according to claim 4, wherein said piston is carried by said hose body by means of piston adapter fixedly secured to the foot end of said hose body and encircled by said piston and to which said piston is attached, and wherein said tubular plug-in adapter is matingly removably connected to said piston adapter.
 8. A flexible suction hose according to claim 4 wherein said tubular plug-in adapter is fixedly secured on a portion of the foot end of said hose body, a tubular piston adapter on which said flexible piston is mounted, and means detachably connecting said piston adapter to the plug-in adapter.
 9. A flexible suction hose adapted for use with vacuum cleaning equipment of the type having a stationary hose-retracting outlet receptacle and a stationary plug-in outlet receptacle connected to a source of suction and wherein a suction conduit of greater length and internal diameter than the hose serves to connect a hose-receiving tubular member of the hose-retracting outlet receptacle to the source of suction; said flexible hose comprising an elongate hose body having a foot end, a flexible piston fixedly secured on a portion of the foot end of said hose body, a tubular plug-in adapter carried by the foot end of said hose body and positioned axially outwardly of said piston, said plug-in adapter having a portion remote from said piston body adapted to be removably connected to said plug-in outlet receptacle, and said piston being adapted to be passed through the hose-retracting outlet receptacle and to sealingly engage the inner surface of said suction conduit whereby said hose may be used alternatively at both the hose-retracting receptacle and the plug-in receptacle and said hose may be stored, at least in part, within the suction conduit. 